Liquid fuel control for burners



. 1939-0 1 s. w. E ANDERSSON 2,151,001

' LIQUID FUEL CONTROL FOR BURNERS Filed April 16, 1937 1 3 A'LATTORNEY Patented Mar. 21, 1939 UNITED STATE-S 2,151,001 LIQUID FUEL CONTROL FOR BURNERS Sven W. E. Andersson, Evansville, Ind., assignor to Servel, Inc., New York, N. I, a corporation of Delaware "Application April 16, 1931, Serial No. 13mm 1 Claim. (01. 137-68) My invention relates to liquid fuel burners and it is an object of the invention to provide an improved control for a liquid fuel burner as will appear from the following description and accompanying drawing forming part of the specification, and of which: Fig. 1 is a part elevation and part vertical sectional view of a liquid fuel burner embodying the invention; and Fig. 2 is a fragmentary view of the device shown in Fig. 1.

An annular vaporizing well I8 is provided with a combustion chimneyil. The upper end of a burner tube I2 is connected .to the vaporizing well in. The lower end of the burner tube I2 is connected by a conduit 3 to a float vessel l4. The conduit l3 communicates with a passage IS in the float vessel l4. The passage I5 is controlled by a weighted valve member l6 normally held in its open position by a catch l1 and a fusible llnk' II. The fusible link I8 is located just beneath the lower end of the combustion chimney so that the fusible link will be melted upon backfire of the burner to release the valve l6 which descends and closes the fuel passage ii.

The passage I5 communicates with the lower part of a. chamber IS in the float vessel H. The upper part of chamber l9 communicates with the upper part of the float chamber 28 so that I chambers l9 and 20 are at the same pressure.

A passage 2| provides for inlet of liquid fuel to the float vessel M. A liquid fuel supply pipe, not shown, may be threaded into the outer end of the passage 2|. A bushing 22 forms a valve p ssage 23 from the inlet passage 2| into the float chamber 20. A valve member 24 is operable to open and close the valve passage 23. A float 25 in the float chamber 20 is connected to one end of a lever 26. The lever 28 is pivoted on bracket 21 and the other end 28 of this lever operatively engages the valve member 24.

A bushing 28 threaded through an opening in the bottom of a partition 38 forms apassage 3| from the lower part of the float chamber 28 into the overflow chamber l8. The upper endof the bushing 29 is internally threaded to receive an external thread on the lower end of a member 32. The lower end of the member 32 isprovided with a small flow restricting passage 33. The upper end of the passage 33 communicates witha cross passage 34 through the member 32. The lower end of passage 33 is open at the bottom end of the member 32. I

The upper end of member 32 is provided with acentral passage 36 which is directly in line with the lower flow restricting passage 33. The lower end of passage 35 opens into the cross passage 34 and the upper end of passage 35 is threaded to receive a bushing 36 which holds a knob 31 in place on the upper end of the member 32. The 5 upper end'of the member 32 extends through an opening in the top of the float vessel |4 so that the knob 31 is outside of the float vessel.

A needle valve member 38 is located in the lower end of the passage 35 just above the cross 10 passage 34. The valve member 38 is provided with a stem 39 which extends upward in the passage 35 and through the central opening in the bushing 36. A spiral spring 40 is placed around the valve stem 39 in the passage 35 between the 15 lower end of the bushing. and the top of the valve member 38. The spring 40 urges the valve member 38 downward so that if the valve member 38 is not restrained it moves downward through the cross passage 34 and seats on the 20 upper edge of the flow restrictin passage 33 to close this passage. A U-shaped piece 4| is pivoted at 42 to the upper end of the valve stem 38. The pivot point is intermediate the head and leg ends of the U-shaped member 4|. When the 25 member 4| is upright with its legs on the head of the bushing '36, asshown in Fig. 1, and in dotted outline in Fig. 2-, the shut-off valve member 38 is held upward against the action of spring 48 so that the passage 33 is entirely open. The 30 member 4| may be termed a catch. By turning the upper end of the catch 4| so that the legs are displaced out of line with the upper end of the valve stem 39, the spring 4|] moves the valve member 38 downward to shut the passage 33 and the catch 4| is moved to a horizontal position on the head of the bushing 36 as shown in solid outline in Fig. 2.

Assuming now that the burner and float chamber are empty, the float 23 will be downward and 40 the valve 24 lifted. Liquid fuel fromthe supply passage 2| flows through valve passage 23 into the float chamber 20. 'As the float chamber 20 fills, liquid flows through passage 3|, the small passage 33, and, when the level in float chamber 45 28 is high enough, the liquid then flows from the upper end of passage 33 into the cross passage 84' and thence into the overflow chamber I9. Liquid flows from the chamber I3 through passagel! andconduit |3 into theburner tube I2. 50 Liquid rlses in the float chamber 28 until it reaches a level at which the float 26 closes'the valve member 24. when the burner is placed in operation and liquid fuel, such as kerosene, is consumed from 55 theburnertube l2,thelevelofliduidinthe bm'nertubeiiandtheoverflowchamberil recedes. Thiscausesfurtherflowof liquidfuel fromthefloatchamherilintotheoverflowehamber ll. theupperendof the flow restricting passage It being located sufllciently"below the level of liquid maintained in the float chamber II. The rate of flow'of liquid fuel from the float chamber ll through the passage 38 may be varied bychangingthedistanoeoitheupperendof the e 83 belowthe level of liquid in the float chamber 2.. This is done by screwing the member 32 up'or down in the bushing 20 by manipulation of the knob 81 outside of the float vessel. As the member I! is lowered, the head of liquid in the float chamber 2| acting to cause flow of liquid through the small passage I3 is increased, whereby the overflow feed of liquid fuel into chamber it is increased.

Tripping the catch ll, as previously explained, cuts of! the drip feed into the chamber I! and thus to the burner well; This is a convenient way to prevent kerosene from flowing into the burner well before cleaning of the well. Quick tripping of the valve to its shut-oil position is also useful toshut oi! fuelflowtothehurnerincaseoian emergency.

Various changes and modifications may be made within the scope oi. the invention which is not limited as shown in the drawing and-described intheforegoingpartofthespeciflcation, but only as indicated in the following claim.

What is claimed is:

Inaliquidfuelhirnerhavingaburnerwell and a constant level chamber, a conduit for conducting liquid fuel from said chamber to the well, means for regulating the flow of liquid between. said chamber and said well, said means including a. vertically adjustable conduit structure, a valve member carried by and incorporated in said structure in adiustably movable relation thereto, means for operating said valve member, said valve member being vertically movable with said structure whereby the relation between the valve and the-conduit structure will be kept the same when the conduit structure is adjusted from one position to another.

svsu w." s. smasnssou. 

